Diversity receiving apparatus, controlling method of the same, and computer-readable medium containing program therefor

Abstract

A diversity receiving apparatus receives first and second reception signals and is constituted by including one or more phase shifters that generate one or more third signals having phases different from the second reception signal based on the second reception signal, a correlation calculator that obtains a correlation between the first reception signal and each of the second reception signal and the third reception signals, a correlation comparator that selects the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals, a selector that selects and outputs the second reception signal or the third reception signal selected by the correlation comparator; and a combining device that outputs a signal formed by combining the first reception signal and the reception signal output from the selector.

1. A diversity receiving apparatus to which first and second reception signals received by different antennas are input, comprising:
 one or more phase shifters that generate one or more third signals having phases different from the second reception signal based on the second reception signal; 
 a correlation calculator that obtains a correlation between the first reception signal and each of the second reception signal and the third reception signals; 
 a correlation comparator that selects the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals; 
 a selector that selects and outputs one of the second reception signal or the third reception signals, based on an output of the correlation comparator; 
 a combining device that outputs a signal formed by combining the first reception signal and the reception signal output from the selector; and 
 a trigger issuing section that issues a trigger signal at predetermined time intervals, 
 wherein the correlation calculator obtains the correlation between the first reception signal and each of the second reception signal and the third reception signals every time the trigger signal is issued, and 
 wherein the correlation comparator selects the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals every time the trigger signal is issued. 
 
   
   
     2. The diversity receiving apparatus of  claim 1 ,
 wherein the correlation calculator obtains the correlation by substituting a sampling value of the first reception signal and a sampling value of the second reception signal or the third reception signals for the Pearson's product moment correlation coefficient formula. 
 
   
   
     3. The diversity receiving apparatus of  claim 1 ,
 wherein the phase shifter is constituted by a delaying device. 
 
   
   
     4. The diversity receiving apparatus of  claim 1 , comprising:
 a first front end section that amplifies and supplies the first reception signal to the correlation calculator and the combining device; and 
 a second front end section that amplifies and supplies the second reception signal to the correlation calculator and the combining device. 
 
   
   
     5. The diversity receiving apparatus of  claim 1 ,
 wherein the correlation calculator or the correlation comparator is realized by at least one of software control with an MPU, a process using a DSP, or wired logic. 
 
   
   
     6. A controlling method of a diversity receiving apparatus to which first and second reception signals received by different antennas are input, comprising the steps of:
 using one or more phase shifters to generate one or more third signals having phases different from the second reception signal based on the second reception signal; 
 issuing a trigger signal at predetermined time intervals; 
 obtaining a correlation between the first reception signal and each of the second reception signal and the third reception signals; 
 selecting the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals; 
 selecting and outputting the selected one of the second reception signal or the third reception signals; and 
 outputting a signal formed by combining the first reception signal and the output reception signal, 
 wherein obtaining the correlation between the first reception signal and each of the second reception signal and the third reception signals and selecting the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals are performed every time the trigger signal is issued. 
 
   
   
     7. A computer-readable medium containing a program used in the diversity receiving apparatus of  claim 1 , the program realizing the functions of:
 obtaining a correlation between the first reception signal and each of the second reception signal and the third reception signals, which is performed by the correlation calculator; and 
 selecting the reception signal having the highest correlation with the first reception signal from the second reception signal and the third reception signals, which is performed by the correlation comparator.